













i6a 



Analy/is of the Air. 



phurcous grofs vapours, or whether it was 

 occafioned by fome unheeded palTagefor the 

 air thro' the ligatures, I am uncertain ; nei- 

 ther did I care to afcertain the matter by re- 

 peated Experiments, fearing I might thereby 

 fome way injure my lungs, by frequently 

 breathing in fuch grofs vapours. 



Hence Sal Tartar fhould be the beft pre- 

 fervative againft noxious vapours, as being a 

 very ftrong imbiber of fulphureous, acid and 

 watry vapours, as is fea fait alfo : For ha- 

 ving carefully weighed the 4 Diaphragms, 

 before I fixt them in the inftrument, I found 

 that they had incrcafed in weight 30 grains 

 in five minutes 5 and it was the fame in two 

 Afferent tryals; fothey incrcafed in weight 

 ac the rate of 19 ounces in 24 hours. From 

 which deducting £ part for the quantity of 

 moifture, which I found thofe Diaphragms 

 attracted in 5 minutes in the open air 5 there 

 remains 1 5 -j- f ounces, for the weight of 

 the moifture from the breath in 24 hours : 

 But this is probably too great an allowance, 

 confidering that the Diphragvis might at- 

 tract more than £ part from the moifture of 

 the bladders and of the fyphon. 



•0 



• i 



m 

 ton 





I have '^ 





